/* https://developer.mozilla.org/en/docs/Web/CSS/box-shadow box-shadow: [inset?] [top] [left] [blur] [size] [color];
 Tips: - We're setting all the blurs to 0 since we want a solid fill. - Add the inset keyword so the box-shadow is on the inside of the element - Animating the inset shadow on hover looks like the element is filling in from whatever side you specify ([top] and [left] accept negative values to become [bottom] and [right]) - Multiple shadows can be stacked - If you're animating multiple shadows, be sure to keep the same number of shadows so the animation is smooth. Otherwise, you'll get something choppy. */
.fill:hover,
.fill:focus {
  box-shadow: inset 0 0 0 2em var(--hover);
}
.pulse:hover,
.pulse:focus {
  animation: pulse 1s;
  box-shadow: 0 0 0 2em rgba(255, 255, 255, 0);
}
@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 var(--hover);
  }
}
.close:hover,
.close:focus {
  box-shadow: inset -3.5em 0 0 0 var(--hover), inset 3.5em 0 0 0 var(--hover);
}
.raise:hover,
.raise:focus {
  box-shadow: 0 0.5em 0.5em -0.4em var(--hover);
  transform: translateY(-0.25em);
}
.up:hover,
.up:focus {
  box-shadow: inset 0 -3.25em 0 0 var(--hover);
}
.slide:hover,
.slide:focus {
  box-shadow: inset 6.5em 0 0 0 var(--hover);
}
.offset {
  box-shadow: 0.3em 0.3em 0 0 var(--color), inset 0.3em 0.3em 0 0 var(--color);
}
.offset:hover,
.offset:focus {
  box-shadow: 0 0 0 0 var(--hover), inset 6em 3.5em 0 0 var(--hover);
}
.pulse {
  --color: #ef6eae;
  --hover: #88fcfc;
}
button {
  color: var(--color);
  transition: 0.25s;
}
button:hover,
button:focus {
  border-color: var(--hover);
  color: #fff;
}
button {
  background: none;
  border: 2px solid;
  font: inherit;
  line-height: 1;
  margin: 1em;
  padding: 1em 2em;
}
